It occurs associated with uraninite, becquerelite, fourmarierite, phosphouranylite, gypsum and fluorite.
2.
In addition to uraninite it occurs associated with the rare minerals becquerelite, masuyite, schoepite, kasolite, curite, boltwoodite, vandendriesscheite, billietite, metatorbernite, fourmarierite, studtite and sklodowskite.
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